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Ever wondered why cutting a single onion turns on the waterworks? It’s not just a physical reaction—it’s actually a chemical defense system built into the onion!

In this quick video, we break down the exact chemical reaction that happens when your knife strikes an onion, how it turns into an airborne gas, and why your eyes produce tears to protect themselves.

👉 What you'll learn in this short:

The chemical compound responsible for making you cry (Syn-propanethial-S-oxide)

Why tears are your eyes' natural defense mechanism

Quick, practical tips to stop crying the next time you chop onions

If you found this video helpful, make sure to Like, Follow, and Share for more daily body and health facts!

#WhyDoOnionsMakeYouCry #OnionTears #KitchenHacks #BodyFacts #HealthScience #HumanBody #ScienceFacts #DidYouKnow #CookingTips #Shorts

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Transcription
00:00You just sliced into an onion.
00:03Your eyes are about to declare war on you.
00:10Meet the onion's defense cells.
00:13When you cut them open, they release an...
00:15They release a chemical weapon on purpose.
00:18On purpose.
00:21That chemical drifts up as a gas and hits a very specific target.
00:25Your eyes.
00:30The second it touches your eyes, it reacts with your tears and forms a mild acid right on the surface.
00:37Right on the surface.
00:42Your eyes detect the irritation instantly and trigger even more tears to flush it out.
00:52So you're not sad.
00:54You're being chemically defended against by a vegetable.
01:00The fix, chill the onion first, or cut it near running water.
01:04Cold and moisture both slow the gas down before it reaches you.

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